An Architecture for Differentiated Services
RFC 2475
| Document | Type |
RFC - Informational
(December 1998; No errata)
Updated by RFC 3260
|
|
|---|---|---|---|
| Last updated | 2013-03-02 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 2475 (Informational) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | (None) | ||
| Send notices to | (None) | ||
Network Working Group S. Blake
Request for Comments: 2475 Torrent Networking Technologies
Category: Informational D. Black
EMC Corporation
M. Carlson
Sun Microsystems
E. Davies
Nortel UK
Z. Wang
Bell Labs Lucent Technologies
W. Weiss
Lucent Technologies
December 1998
An Architecture for Differentiated Services
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (1998). All Rights Reserved.
Abstract
This document defines an architecture for implementing scalable
service differentiation in the Internet. This architecture achieves
scalability by aggregating traffic classification state which is
conveyed by means of IP-layer packet marking using the DS field
[DSFIELD]. Packets are classified and marked to receive a particular
per-hop forwarding behavior on nodes along their path. Sophisticated
classification, marking, policing, and shaping operations need only
be implemented at network boundaries or hosts. Network resources are
allocated to traffic streams by service provisioning policies which
govern how traffic is marked and conditioned upon entry to a
differentiated services-capable network, and how that traffic is
forwarded within that network. A wide variety of services can be
implemented on top of these building blocks.
Blake, et. al. Informational [Page 1]
RFC 2475 Architecture for Differentiated Services December 1998
Table of Contents
1. Introduction ................................................. 2
1.1 Overview ................................................. 2
1.2 Terminology ............................................... 4
1.3 Requirements .............................................. 8
1.4 Comparisons with Other Approaches ......................... 9
2. Differentiated Services Architectural Model .................. 12
2.1 Differentiated Services Domain ............................ 12
2.1.1 DS Boundary Nodes and Interior Nodes .................. 12
2.1.2 DS Ingress Node and Egress Node ....................... 13
2.2 Differentiated Services Region ............................ 13
2.3 Traffic Classification and Conditioning ................... 14
2.3.1 Classifiers ........................................... 14
2.3.2 Traffic Profiles ...................................... 15
2.3.3 Traffic Conditioners .................................. 15
2.3.3.1 Meters ............................................ 16
2.3.3.2 Markers ........................................... 16
2.3.3.3 Shapers ........................................... 17
2.3.3.4 Droppers .......................................... 17
2.3.4 Location of Traffic Conditioners and MF Classifiers ... 17
2.3.4.1 Within the Source Domain .......................... 17
2.3.4.2 At the Boundary of a DS Domain .................... 18
2.3.4.3 In non-DS-Capable Domains ......................... 18
2.3.4.4 In Interior DS Nodes .............................. 19
2.4 Per-Hop Behaviors ......................................... 19
2.5 Network Resource Allocation ............................... 20
3. Per-Hop Behavior Specification Guidelines .................... 21
4. Interoperability with Non-Differentiated Services-Compliant
Nodes ........................................................ 25
5. Multicast Considerations ..................................... 26
6. Security and Tunneling Considerations ........................ 27
6.1 Theft and Denial of Service ............................... 28
6.2 IPsec and Tunneling Interactions .......................... 30
6.3 Auditing .................................................. 32
7. Acknowledgements ............................................. 32
8. References ................................................... 33
Authors' Addresses ............................................... 34
Full Copyright Statement ......................................... 36
Show full document text